How to sanitize lipbalm tubes

Hi,
I'd like to find out how to sanitize my lip balm tubes before I fill them. The answers on the internet are all over the place! Due to allergies, I won't be using any synthetic preservatives (I'm going to test out PhytoCide Elderberry OS, INCI: Sambuca NIgra Fruit Extract instead).
I was thinking of using a bath of 91% Isopropyl Alcohol and then letting air dry. Will this dry out of them all the way? I'm using white polypropylene oval tubes.
Thanks, Toni

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